Answer:
Use the Rydberg Equation 1/λ = R(1/n²(final) - 1/n²(initial) where R = 109,678 cm⁻¹. Substitute initial orbital number and final orbital number and solve for wavelength (λ).
Explanation:
Example:
Assume an electron transition from n = 5 to n = 2.
1/λ = 109,678cm⁻¹(1/2² - 1/5²) = 109,678(0.25 - 0.04)cm⁻¹ = 23,032cm⁻¹
λ = 1/23,032cm⁻¹ = 4.34 x 10⁻⁵cm x 10⁻²m/cm x 10⁹nm/m = 434nm
Which of the following represents alpha decay?
O A. 169 Gd 108TB +_9e
B. 159 Eu + je → 189 Sm
150
-
C. 90T = 9T +
→ 43
O D. GO → 1945m + He
148
There are two modes in which unstable nuclei of radioactive elements may decay. They are by α - emission or by β - emission. Among the given options, the α - emission is ₆₄¹⁴⁸Gd → ₆₂¹⁴⁴Sm + ₂⁴He. The correct option is D.
What is α - decay?According to the theory of radioactive disintegration, the atoms of all the radioactive elements undergo spontaneous disintegration with the emission of α or β particles to yield atoms of new elements. When a radionuclide decays by emitting an α - particle, it is called α - decay.
When a radionuclide undergoes α - emission, i.e. a helium nucleus there occurs a decrease of 2 units in the atomic number and a decrease of 4 units in the mass number. The new nuclide produced has an atomic number 2 units less and a mass number 4 units less than the parent.
₆₄¹⁴⁸Gd → ₆₂¹⁴⁴Sm + ₂⁴He represents α - emission.
Thus the correct option is D.
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When 0.005 moles of silver(1) nitrate reacts with sodium carbonate, which of the following statement is correct?
(You must show all your work)
A) This is a redox reaction
B) This is a precipitation reaction and 0.69 g of the precipitate will be formed
C) This is a precipitation reaction and 1.38 g of the precipitate will be formed
D) This is a precipitation reaction and 0.83 g of the precipitate will be formed
Explanation:
no sé de qué me estás hablando
This is a precipitation reaction and 1.38 g of the precipitate will be formed is the statement is correct. Hence, option C is correct.
What is a precipitation reaction?A precipitation reaction is when two or more dissolved chemicals combine to form one solid products. The exchange of ions between ionic compounds in aqueous solutions is a common component of these reactions, which are also occasionally referred to as double displacement, double replacement, or metathesis reactions.
in response to precipitation a process that converts soluble salts into solids that are insoluble in water. a neutralizing response an interaction between an acid and a base that results in the production of salt, water, and an ionic molecule.
Precipitate refers to a solid that forms from a solution. The blending of two transparent solutions is a common example: NaCl in combination with silver nitrate The answer is. The soli cannot be dissolved in water.
Thus, option C is correct.
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The Thermal Energy
The thermal energy of an object is the total kinetic energy of its particles. An object's
thermal energy depends on the mass of the object, its temperature, its state of matter,
and its chemical composition. Larger objects have more thermal energy than smaller
objects of the same material and density at the same temperature. A liquid substance
has more thermal energy than the same mass of the substance in its solid form.
9. Suppose you have two identical objects made of the same mass of the same material.
If one object is 20 °C warmer than the other, which object has more thermal energy?
Thermal Energy is directly proportional to the temperature
Or
[tex]\\ \sf\longmapsto Thermal\: Energy\propto Temperature [/tex]
So if temperature increases the thermal Energy also increases.
An object which is 20°C warmer than other has more thermal energy
which one is not allotropes of carbon?
Answer:
B. Activated Carbon
Explanation:
Eating a healthy breakfast gives your body the energy needed to help you start your day.. The girl in the photo is having cereal and orange jucie, both of which habe stored _____ energy, a form of ____________ energy. The girls body breaks down the components of the food to access the energy __________ in them. Later in the day, some of this energy is _______ into _ energy that will alow the girl to study and play sports. Some of this energy is also _________ into ____ energy that keeps her body warm.
Answer:
Words are filled in
Eating a healthy breakfast gives your body the energy needed to help you start your day.. The girl in the photo is having cereal and orange jucie, both of which have stored chemical energy, a form of potential energy. The girls body breaks down the components of the food to access the energy in them. Later in the day, some of this energy is transformed into kinetic energy that will allow the girl to study and play sports. Some of this energy is also transformed into thermal energy that keeps her body warm.
Explanation:
I. Indicate whether the following statements are true or false 1. The entropy of a fixed amount of an incompressible substance increases in every process for which temperature increase. A: True B: False 2. A closed system can experience a decrease in entropy only when there is heat transfer from the system to its surroundings during the process. A: True B: False 3. Entropy is produced in every internally reversible process of a closed system. A: True B: False 4. In an adiabatic and internally reversible process of a closed system the entropy remains constant A: True B: False 5. The entropy of a fixed amount of an ideal gas increases in every isothermal process A: True B: False 6. The energy of an isolated system must remain constant, but the entropy can only decrease A: True B: False 7. The entropy change of a closed system during a process can be greater than, equal to, or less than zero. A: True B: False
What is scalar quantity ?
Answer:
they physical quantities that are uneffected by changes to a vector space basis
Wyndirbu lie the following best describes the role played by
hydraulic fluid a hydraulic machine?
А
A source of fuel
B
A medium for the transfer of force
С
A coolant
D
A cleaning agent
Help pls
The role played by hydraulic fluid in a hydraulic machine is as a medium for
the transfer of force.
Hydraulic fluid is used primarily in a hydraulic machine for the transfer of
force from one point to another. This makes the system able to perform the
required functions.
Hydraulic fluid also has other functions such as being a coolant and as a
cleaning agent(removal of contaminants) which aren't its major function.
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For the formula shown, how many sulfur atoms are represented?
Answer:
Your answer would be 6
Answer:
1 it is 1
Explanation:
the atomic number of magnsium is 12 this means that that its nucleus must contain
Explanation:
Since magnesium has an atomic number of 12, that means that it has 12 protons and 12 electrons when it is in normal state.
Answer:
12 protons
Explanation:
A burning candle demonstrates the following type of energy transformations.
A: chemical → heat → light
B: heat → chemical → light
C: electrical → light
D: chemical → electrical → light
Answer:
B
Explanation:
the candle is hot so the first energy form should be heat. u could now just eliminate the rest but for further notice. the heat melts the wax in the candle, which is a physical change but also the thread is burning out which is a chemical change then light follows
Identify key concepts/terminologies about solutions or concentration of solutions
PLS HELP ASAP!!
identify keys concepts/terminologies about solutions or concentration of solutions.
Answer:They are the two basic solution concentration terms that you need to know.We always need to keep an account of the amount of solute in a solution.The amount of solute in the solvent is what is called the concentration of a solution.In chemistry,we define concentration of solution as the amount of solute in a solvent.
Explanation:Depending upon amount of solute present,it is called a dilute, concentrated or a saturated solution.Different substances in a given solvent have a different solubilities at the same temperature.The most common method for expressing the concentration of a solution is the percentage method
#Carry On Learning :)Dirty water is a _____.
mixture
or
compound ?
Answer: mixture
Explanation: they are heterogeneous mixtures not homogeneous
It's Mixture
Reason:- Dirty water is a mixture of dirt and water. Mixture are made up of 2 or more different substance with different characteristics
How do atomic and molecular interactions explain the properties of matter that we see and feel
The atomic and molecular interactions unveil the bulk properties of matter in our environment by ways of the fact that everything in the whole universe is made of either atoms, molecules or even ions
How matter is made up of atoms and molecules?It has been proven practically everything in the whole universe is matter and everything which interact with matter is also matter. This explains to us the reasons why matter could be atoms, molecules or ions.
That being said, some substances (matter) is made up of atoms of elements, some made up of molecules or atoms and molecules and others ions or both. However, matter is anything which has mass and occupies space.
In conclusion, we can now conclude from the explanation above that the properties of matter are as a result of the interaction which exists between matter at the atomic and molecular level.
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What is heat of reaction? Tell me In a short description?
Answer:
The Heat of Reaction (also known and Enthalpy of Reaction) is the change in the enthalpy of a chemical reaction that occurs at a constant pressure. It is a thermodynamic unit of measurement useful for calculating the amount of energy per mole either released or produced in a reaction.
Determine the concentration of a diluted solution of sodium chloride that was prepared by diluting 20.0 mL of a 4.5 M solution of sodium chloride to 500.0 mL.
Answer:
ok
Explanation:
How many moles of lithium hydroxide would be required to produce 38.5 g of Li₂CO₃ in the following chemical reaction?
2 LiOH(s) + CO₂(g) → Li₂CO₃(s) + H₂O(l)
Numer of moles of Li₂CO₃:
[tex]\longrightarrow\: n_{(Li_2 CO_3)} = \dfrac{38.5}{(6 \times 2) + 12 + (16 \times 3)}[/tex]
[tex]\longrightarrow\: n_{(Li_2 CO_3)} = \dfrac{38.5}{12+ 12 +48}[/tex]
[tex]\longrightarrow\: n_{(Li_2 CO_3)} = \dfrac{38.5}{72}[/tex]
[tex]\longrightarrow\: n_{(Li_2 CO_3)} = 0.53473 \: mol[/tex]
Chemical Reaction:
2 LiOH(s) + CO₂(g) → Li₂CO₃(s) + H₂O(l)
1 mole of Li₂CO₃ is formed from 2 moles of LiOH.Therefore, applying unitary method:
0.53473 mole of Li₂CO₃ is formed from 2 × 0.53473 = 1.06946 moles of LiOH.No. of moles of lithium hydroxide would be required to produce 38.5 g of Li₂CO₃ in the following chemical reaction are 1.03.
What is mole concept?Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.
No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.
Mass of a particular product is also find out by stoichiometry of a reaction as per the no. of mole given in the reaction.
Given,
2LiOH(s) + CO₂(g) → Li₂CO₃(s) + H₂O(l)
2 moles of LiOH are required to produce 73.8g Li₂CO₃
0.027 moles of LiOH are required to produce 1g Li₂CO₃
1.03 moles of LiOH are required to produce 38.5 Li₂CO₃
Therefore, No. of moles of lithium hydroxide would be required to produce 38.5 g of Li₂CO₃ in the following chemical reaction are 1.03.
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Which of the following has kinetic energy?
O A compressed spring
O An arrow shot from a bow
O water in a reservoir at a hill top
O Amonkey hanging from a tree
Kinetic energy is energy that an object possesses due to its motion.
Lets look at each option:
A compressed spring has potential energy.
An arrow shot from a bow does have Kinetic energy.
Water in a reservoir at a hill top is potential energy.
A monkey hanging from a tree is potential energy.
This means that the answer is B) An arrow shot from a bow
I hope this helps! :)
According to law of conservation of energy,energy is converted from one form to another so by this fact an arrow shot from a bow has kinetic energy generated from potential energy.
What is law of conservation of energy?
According to law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1842.
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Thermal energy is associated with _____.(1 point)
electric charge
particle motion
bond strength
substance volume
Answer:
see below
Explanation:
1. particle motion
2. The particles of a liquid can slide past one another.
3. the kinetic energy required to break forces between particles
4. increasing its temperature until it transitions from a solid to a liquid
5. A liquid becomes a gas.
[quizlet: captncrun]
Thermal energy is in the form of heat and light is always associated with the random motion of atoms and molecules. That form of kinetic energy is used to the rise in temperature.
The energy is released from the particles that are heated and collide with each other. This takes place by the particle motion.Hence the option B is correct.
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Which of the following solutions represents a good buffer system? a solution that is 0.10 mol L-1 NaOH and 0.10 mol L-1 KOH a solution that is 0.10 mol L-1 HCl and 0.10 mol L-1 NH4+ a solution that is 0.10 mol L-1 HF and 0.10 mol L-1 CH3COONa a solution that is 0.10 mol L-1 HCl and 0.10 mol L-1 KCl a solution that is 0.10 mol L-1 CH3COOH and 0.10 mol L-1 CH3COOLi
Answer:
chu papi
Explanation:
The primary role of coenzyme A in aerobic respiration is to
A. speed up the citric acid cycle.
B. transport electrons to FAD
C. kick off the transport electron cascade.
D. activate acetyl CoA and other molecules in the citric acid cycle.
Answer:
I could be wrong but i believe the answer is D. It was not B when i took the test
Explanation:
How many molecules of oxygen can be made from 9.52g of nickel (III) oxide?
Answer:
165.385 g/mol
explain why water wasn't used in crackers?
Assume that the heat lost by the surface is gained by ethyl chloride. What enthalpies must you consider if you were to calculate the final temperature of the surface
Answer:
Specific heat of ethyl chloride in gas and liquid phases, enthalpy of vaporization and specific heat of solid surface.
Explanation:
In order to determine the final temperature, the heat lost by the chloride needs to be found. This would require the specific heat in both phases and the enthalpy of vaporization. (you will use q=mc(delta)T and q=m(delta)H)
Then the energy gained by the surface needs to be found. This will require the specific heat in order to use the q=mc(delta)T equation.
The enthalpies that we consider to calculate the final temperature of the surface are Specific heat of surface and ethyl chloride as well as Heat of vaporization of liquid & vapor ethyl chloride.
What is enthalpy?Enthalpy of any reaction tells about the total amount of heat absrobed and released during a chemical reaction.
According to the question, heat released by the surface is absorbed by the ethyl chloride and by absorbing this energy ethyl chlorode will change into the vapor form. In the whole process if we want ot calculate the final temperature on the surface then we should consider:
Specific heat of surface.Specific heat of ethyl chloride.Heat of vaporization of liquid ethyl chloride.Heat of vaporization of vapor ethyl chlorideHence, required enthalpies are Specific heat of surface and ethyl chloride as well as Heat of vaporization of liquid & vapor ethyl chloride.
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Which group is composed entirely of nonmetals?
Answer:
These are the nonmetals.
Help please :) with this
Answer:
The answer is 3
Explanation:
Hope this helps and have a wonderful day.
What is a reaction that alkanes undergo ?
A. precipitation reactions
B. combustion reaction
C. acid base reactions
D. all of the above
What other inventions came because of the microscope? (These are inventions that are related to the microscope in some way.)
Answer:
Explanation:Leeuwenhoek observed animal and plant tissue, human sperm and blood cells, minerals, fossils, and many other things that had never been seen before on a microscopic scale. He presented his findings to the Royal Society in London, where Robert Hooke was also making remarkable discoveries with a microscope.
How many total atoms of Nitrogen are shown in the formula below?
formula in question: 4N20
awnsers for problem
A.2
B.4
C.6
D.8
includes photo
Giveing 50 brainlys to the right awnser
The number of atoms of nitrogen in 4N₂O is 8 atoms.
Atom are the basic or fundamental units of matter that defines its structure.
The atom housed the proton, neutron and electron. The atoms of nitrogen in 4 moles of the Nitrogen oxide is the number of each nitrogen present in it .
Therefore,
4N₂O → Number of atoms of Nitrogen will be 4 × 2 = 8 atoms.
Therefore, the number of atoms of nitrogen in the compound 4N₂O is 8.
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Observe the superscript of N
It's 2Means
There is 2 atoms of N in 1 molecule of Nitric oxideNow as there is 4 multiplied
Total atoms=4(2)=8Respiration describes the process that living cells use to release energy by combining sugar and oxygen. The primary chemical changes that happen during respiration are shown in the equation below.
C6H12O6 + 6O2 ---> 6CO2 + 6H2O + energy
Which statement correctly compares the reactants and products of the equation?
A.
The mass of the reactants is less than the mass of the products.
B.
The mass of the reactants is greater than the mass of the products.
C.
The mass of the reactants is the same as the mass of the products.
D.
The number of reactant molecules is greater than the number of products.
Answer:
C the mass of the reactant molecules is the same as the mass of the product